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REBa2ZrO5.5 (RE = La, Ce, Eu, and Yb): Synthesis, characterization, and their potential use as substrates for YBa2Cu3O7–δ superconductors

Published online by Cambridge University Press:  31 January 2011

R. Jose ,
Asha M. John ,
J. Kurian ,
P. K. Sajith  and
J. Koshy
R. Jose
Affiliation:
Regional Research Laboratory (CSIR), Trivandrum-695 019, India
Asha M. John
Affiliation:
Regional Research Laboratory (CSIR), Trivandrum-695 019, India
J. Kurian
Affiliation:
Regional Research Laboratory (CSIR), Trivandrum-695 019, India
P. K. Sajith
Affiliation:
Regional Research Laboratory (CSIR), Trivandrum-695 019, India
J. Koshy*
Affiliation:
Regional Research Laboratory (CSIR), Trivandrum-695 019, India
*
a)Author to whom all correspondence should be addressed.
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Abstract

A new class of complex perovskites REBa2ZrO5.5 (where RE = La, Ce, Eu, and Yb) have been synthesized and sintered as single phase materials by the solid state reaction method. The structure of these materials was studied by x-ray diffraction, and all of them were found to be isostructural, having a cubic perovskite structure. X-ray diffraction and resistivity measurements have shown that there is no detectable chemical reaction between YBa2Cu3O7–delta; and REBa2ZrO5.5 even under severe heat treatment at 950 °C, and that the addition of REBa2ZrO5.5 up to 20 vol.% in YBa2Cu3O7–δ shows no detrimental effect on the superconducting properties of YBa2Cu3O7-δ. Dielectric constants and loss factors are in the range suitable for their use as substrates for microwave applications. Thick films of YBa2Cu3O7–δ fabricated on polycrystalline REBa2ZrO5.5 substrates gave a zero resistance transition temperature Tc(0) ∼ 92 K, indicating the suitability of these materials as substrates for YBa2Cu3O7–δ.

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Articles
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Journal of Materials Research , Volume 12 , Issue 11 , November 1997 , pp. 2976 - 2980
Copyright
Copyright © Materials Research Society 1997

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References

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